Dmitriy Sergeyev provided a patch that made the SOCKS[45] code work better as

it now will read the full data sent from servers. The SOCKS-related code was
also moved to the new lib/socks.c source file.

6 files changed, 579 insertions, 480 deletions

diff --git a/lib/Makefile.Watcom b/lib/Makefile.Watcom
index 9aa649f06..d34b750c5 100644
--- a/lib/Makefile.Watcom
+++ b/lib/Makefile.Watcom
@@ -46,7 +46,7 @@ OBJS = $(OBJ_DIR)\transfer.obj         $(OBJ_DIR)\file.obj       &
        $(OBJ_DIR)\hostsyn.obj          $(OBJ_DIR)\parsedate.obj  &
        $(OBJ_DIR)\select.obj           $(OBJ_DIR)\sslgen.obj     &
        $(OBJ_DIR)\gtls.obj             $(OBJ_DIR)\tftp.obj       &
-       $(OBJ_DIR)\splay.obj
+       $(OBJ_DIR)\splay.obj	       $(OBJ_DIR)\socks.obj
 
 RESOURCE = $(OBJ_DIR)\libcurl.res
 
diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index 14de41474..d91eac7a2 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -8,7 +8,7 @@ CSOURCES = file.c timeval.c base64.c hostip.c progress.c formdata.c	\
   content_encoding.c share.c http_digest.c md5.c http_negotiate.c	\
   http_ntlm.c inet_pton.c strtoofft.c strerror.c hostares.c hostasyn.c	\
   hostip4.c hostip6.c hostsyn.c hostthre.c inet_ntop.c parsedate.c	\
-  select.c gtls.c sslgen.c tftp.c splay.c strdup.c
+  select.c gtls.c sslgen.c tftp.c splay.c strdup.c socks.c
 
 HHEADERS = arpa_telnet.h netrc.h file.h timeval.h base64.h hostip.h	\
   progress.h formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h	\
@@ -18,6 +18,6 @@ HHEADERS = arpa_telnet.h netrc.h file.h timeval.h base64.h hostip.h	\
   share.h md5.h http_digest.h http_negotiate.h http_ntlm.h ca-bundle.h	\
   inet_pton.h strtoofft.h strerror.h inet_ntop.h curlx.h memory.h	\
   setup.h transfer.h select.h easyif.h multiif.h parsedate.h sslgen.h   \
-  gtls.h tftp.h sockaddr.h splay.h strdup.h setup_once.h
+  gtls.h tftp.h sockaddr.h splay.h strdup.h setup_once.h socks.h
 
 
diff --git a/lib/Makefile.vc6 b/lib/Makefile.vc6
index 6075ccb11..eb7355035 100644
--- a/lib/Makefile.vc6
+++ b/lib/Makefile.vc6
@@ -481,6 +481,7 @@ X_OBJS= \
 	$(DIROBJ)\content_encoding.obj \

 	$(DIROBJ)\tftp.obj \

 	$(DIROBJ)\splay.obj \

+	$(DIROBJ)\socks.obj \

 	$(RESOURCE)

 

 all : $(TARGET)

diff --git a/lib/socks.c b/lib/socks.c
new file mode 100644
index 000000000..acf6eb61c
--- /dev/null
+++ b/lib/socks.c
@@ -0,0 +1,549 @@
+#include "setup.h"
+
+#include "urldata.h"
+#include "sendf.h"
+#include "strequal.h"
+#include "select.h"
+#include "connect.h"
+#include "timeval.h"
+#include "socks.h"
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/*
+ * Helper read-from-socket functions. Does the same as Curl_read() but it
+ * blocks until all bytes amount of buffersize will be read. No more, no less.
+ *
+ * This is STUPID BLOCKING behaviour which we frown upon, but right now this
+ * is what we have...
+ */
+static int blockread_all(struct connectdata *conn, /* connection data */
+                         curl_socket_t sockfd,     /* read from this socket */
+                         char *buf,                /* store read data here */
+                         ssize_t buffersize,       /* max amount to read */
+                         ssize_t *n,               /* amount bytes read */
+                         long conn_timeout)        /* timeout for data wait
+                                                      relative to
+                                                      conn->created */
+{
+  ssize_t nread;
+  ssize_t allread = 0;
+  int result;
+  struct timeval tvnow;
+  long conntime;
+  *n = 0;
+  do {
+    tvnow = Curl_tvnow();
+    /* calculating how long connection is establishing */
+    conntime = Curl_tvdiff(tvnow, conn->created);
+    if(conntime > conn_timeout) {
+      /* we already got the timeout */
+      return -1;
+    }
+    if(Curl_select(sockfd, CURL_SOCKET_BAD,
+                   (int)(conn_timeout - conntime)) <= 0) {
+      return -1;
+    }
+    result = Curl_read(conn, sockfd, buf, buffersize, &nread);
+    if(result)
+      return result;
+
+    if(buffersize == nread) {
+      allread += nread;
+      *n = allread;
+      return CURLE_OK;
+    }
+    buffersize -= nread;
+    buf += nread;
+    allread += nread;
+  } while(1);
+}
+
+/*
+* This function logs in to a SOCKS4 proxy and sends the specifics to the final
+* destination server.
+*
+* Reference :
+*   http://socks.permeo.com/protocol/socks4.protocol
+*
+* Note :
+*   Nonsupport "SOCKS 4A (Simple Extension to SOCKS 4 Protocol)"
+*   Nonsupport "Identification Protocol (RFC1413)"
+*/
+CURLcode Curl_SOCKS4(const char *proxy_name,
+                     struct connectdata *conn)
+{
+  unsigned char socksreq[262]; /* room for SOCKS4 request incl. user id */
+  int result;
+  CURLcode code;
+  curl_socket_t sock = conn->sock[FIRSTSOCKET];
+  long timeout;
+  struct SessionHandle *data = conn->data;
+
+  /* get timeout */
+  if(data->set.timeout && data->set.connecttimeout) {
+    if (data->set.timeout < data->set.connecttimeout)
+      timeout = data->set.timeout*1000;
+    else
+      timeout = data->set.connecttimeout*1000;
+  }
+  else if(data->set.timeout)
+    timeout = data->set.timeout*1000;
+  else if(data->set.connecttimeout)
+    timeout = data->set.connecttimeout*1000;
+  else
+    timeout = DEFAULT_CONNECT_TIMEOUT;
+
+  Curl_nonblock(sock, FALSE);
+
+  /*
+   * Compose socks4 request
+   *
+   * Request format
+   *
+   *     +----+----+----+----+----+----+----+----+----+----+....+----+
+   *     | VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
+   *     +----+----+----+----+----+----+----+----+----+----+....+----+
+   * # of bytes:  1    1      2              4           variable       1
+   */
+
+  socksreq[0] = 4; /* version (SOCKS4) */
+  socksreq[1] = 1; /* connect */
+  *((unsigned short*)&socksreq[2]) = htons(conn->remote_port);
+
+  /* DNS resolve */
+  {
+    struct Curl_dns_entry *dns;
+    Curl_addrinfo *hp=NULL;
+    int rc;
+
+    rc = Curl_resolv(conn, conn->host.name, (int)conn->remote_port, &dns);
+
+    if(rc == CURLRESOLV_ERROR)
+      return CURLE_COULDNT_RESOLVE_PROXY;
+
+    if(rc == CURLRESOLV_PENDING)
+      /* this requires that we're in "wait for resolve" state */
+      rc = Curl_wait_for_resolv(conn, &dns);
+
+    /*
+     * We cannot use 'hostent' as a struct that Curl_resolv() returns.  It
+     * returns a Curl_addrinfo pointer that may not always look the same.
+     */
+    if(dns)
+      hp=dns->addr;
+    if (hp) {
+      char buf[64];
+      unsigned short ip[4];
+      Curl_printable_address(hp, buf, sizeof(buf));
+
+      if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
+                      &ip[0], &ip[1], &ip[2], &ip[3])) {
+        /* Set DSTIP */
+        socksreq[4] = (unsigned char)ip[0];
+        socksreq[5] = (unsigned char)ip[1];
+        socksreq[6] = (unsigned char)ip[2];
+        socksreq[7] = (unsigned char)ip[3];
+      }
+      else
+        hp = NULL; /* fail! */
+
+      Curl_resolv_unlock(data, dns); /* not used anymore from now on */
+
+    }
+    if(!hp) {
+      failf(data, "Failed to resolve \"%s\" for SOCKS4 connect.",
+            conn->host.name);
+      return CURLE_COULDNT_RESOLVE_HOST;
+    }
+  }
+
+  /*
+   * This is currently not supporting "Identification Protocol (RFC1413)".
+   */
+  socksreq[8] = 0; /* ensure empty userid is NUL-terminated */
+  if (proxy_name)
+    strlcat((char*)socksreq + 8, proxy_name, sizeof(socksreq) - 8);
+
+  /*
+   * Make connection
+   */
+  {
+    ssize_t actualread;
+    ssize_t written;
+    int packetsize = 9 +
+      (int)strlen((char*)socksreq + 8); /* size including NUL */
+
+    /* Send request */
+    code = Curl_write(conn, sock, (char *)socksreq, packetsize, &written);
+    if ((code != CURLE_OK) || (written != packetsize)) {
+      failf(data, "Failed to send SOCKS4 connect request.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    packetsize = 8; /* receive data size */
+
+    /* Receive response */
+    result = blockread_all(conn, sock, (char *)socksreq, packetsize,
+                           &actualread, timeout);
+    if ((result != CURLE_OK) || (actualread != packetsize)) {
+      failf(data, "Failed to receive SOCKS4 connect request ack.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /*
+     * Response format
+     *
+     *     +----+----+----+----+----+----+----+----+
+     *     | VN | CD | DSTPORT |      DSTIP        |
+     *     +----+----+----+----+----+----+----+----+
+     * # of bytes:  1    1      2              4
+     *
+     * VN is the version of the reply code and should be 0. CD is the result
+     * code with one of the following values:
+     *
+     * 90: request granted
+     * 91: request rejected or failed
+     * 92: request rejected because SOCKS server cannot connect to
+     *     identd on the client
+     * 93: request rejected because the client program and identd
+     *     report different user-ids
+     */
+
+    /* wrong version ? */
+    if (socksreq[0] != 0) {
+      failf(data,
+            "SOCKS4 reply has wrong version, version should be 4.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /* Result */
+    switch(socksreq[1])
+    {
+    case 90:
+      infof(data, "SOCKS4 request granted.\n");
+      break;
+    case 91:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", request rejected or failed.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    case 92:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", request rejected because SOCKS server cannot connect to "
+            "identd on the client.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    case 93:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", request rejected because the client program and identd "
+            "report different user-ids.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    default:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", Unknown.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    }
+  }
+
+  Curl_nonblock(sock, TRUE);
+
+  return CURLE_OK; /* Proxy was successful! */
+}
+
+/*
+ * This function logs in to a SOCKS5 proxy and sends the specifics to the final
+ * destination server.
+ */
+CURLcode Curl_SOCKS5(const char *proxy_name,
+                     const char *proxy_password,
+                     struct connectdata *conn)
+{
+  /*
+    According to the RFC1928, section "6.  Replies". This is what a SOCK5
+    replies:
+
+        +----+-----+-------+------+----------+----------+
+        |VER | REP |  RSV  | ATYP | BND.ADDR | BND.PORT |
+        +----+-----+-------+------+----------+----------+
+        | 1  |  1  | X'00' |  1   | Variable |    2     |
+        +----+-----+-------+------+----------+----------+
+
+    Where:
+
+    o  VER    protocol version: X'05'
+    o  REP    Reply field:
+    o  X'00' succeeded
+  */
+
+  unsigned char socksreq[600]; /* room for large user/pw (255 max each) */
+  ssize_t actualread;
+  ssize_t written;
+  int result;
+  CURLcode code;
+  curl_socket_t sock = conn->sock[FIRSTSOCKET];
+  struct SessionHandle *data = conn->data;
+  long timeout;
+
+  /* get timeout */
+  if(data->set.timeout && data->set.connecttimeout) {
+    if (data->set.timeout < data->set.connecttimeout)
+      timeout = data->set.timeout*1000;
+    else
+      timeout = data->set.connecttimeout*1000;
+  }
+  else if(data->set.timeout)
+    timeout = data->set.timeout*1000;
+  else if(data->set.connecttimeout)
+    timeout = data->set.connecttimeout*1000;
+  else
+    timeout = DEFAULT_CONNECT_TIMEOUT;
+
+  Curl_nonblock(sock, TRUE);
+
+  /* wait until socket gets connected */
+  result = Curl_select(CURL_SOCKET_BAD, sock, (int)timeout);
+
+  if(-1 == result) {
+    failf(conn->data, "SOCKS5: no connection here");
+    return CURLE_COULDNT_CONNECT;
+  }
+  else if(0 == result) {
+    failf(conn->data, "SOCKS5: connection timeout");
+    return CURLE_OPERATION_TIMEDOUT;
+  }
+
+  if(result & CSELECT_ERR) {
+    failf(conn->data, "SOCKS5: error occured during connection");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  socksreq[0] = 5; /* version */
+  socksreq[1] = (char)(proxy_name ? 2 : 1); /* number of methods (below) */
+  socksreq[2] = 0; /* no authentication */
+  socksreq[3] = 2; /* username/password */
+
+  Curl_nonblock(sock, FALSE);
+
+  code = Curl_write(conn, sock, (char *)socksreq, (2 + (int)socksreq[1]),
+                      &written);
+  if ((code != CURLE_OK) || (written != (2 + (int)socksreq[1]))) {
+    failf(data, "Unable to send initial SOCKS5 request.");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  Curl_nonblock(sock, TRUE);
+
+  result = Curl_select(sock, CURL_SOCKET_BAD, (int)timeout);
+
+  if(-1 == result) {
+    failf(conn->data, "SOCKS5 nothing to read");
+    return CURLE_COULDNT_CONNECT;
+  }
+  else if(0 == result) {
+    failf(conn->data, "SOCKS5 read timeout");
+    return CURLE_OPERATION_TIMEDOUT;
+  }
+
+  if(result & CSELECT_ERR) {
+    failf(conn->data, "SOCKS5 read error occured");
+    return CURLE_RECV_ERROR;
+  }
+
+  Curl_nonblock(sock, FALSE);
+
+  result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread, timeout);
+  if ((result != CURLE_OK) || (actualread != 2)) {
+    failf(data, "Unable to receive initial SOCKS5 response.");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  if (socksreq[0] != 5) {
+    failf(data, "Received invalid version in initial SOCKS5 response.");
+    return CURLE_COULDNT_CONNECT;
+  }
+  if (socksreq[1] == 0) {
+    /* Nothing to do, no authentication needed */
+    ;
+  }
+  else if (socksreq[1] == 2) {
+    /* Needs user name and password */
+    size_t userlen, pwlen;
+    int len;
+    if(proxy_name && proxy_password) {
+      userlen = strlen(proxy_name);
+      pwlen = proxy_password?strlen(proxy_password):0;
+    }
+    else {
+      userlen = 0;
+      pwlen = 0;
+    }
+
+    /*   username/password request looks like
+     * +----+------+----------+------+----------+
+     * |VER | ULEN |  UNAME   | PLEN |  PASSWD  |
+     * +----+------+----------+------+----------+
+     * | 1  |  1   | 1 to 255 |  1   | 1 to 255 |
+     * +----+------+----------+------+----------+
+     */
+    len = 0;
+    socksreq[len++] = 1;    /* username/pw subnegotiation version */
+    socksreq[len++] = (char) userlen;
+    memcpy(socksreq + len, proxy_name, (int) userlen);
+    len += userlen;
+    socksreq[len++] = (char) pwlen;
+    memcpy(socksreq + len, proxy_password, (int) pwlen);
+    len += pwlen;
+
+    code = Curl_write(conn, sock, (char *)socksreq, len, &written);
+    if ((code != CURLE_OK) || (len != written)) {
+      failf(data, "Failed to send SOCKS5 sub-negotiation request.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread,
+                         timeout);
+    if ((result != CURLE_OK) || (actualread != 2)) {
+      failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /* ignore the first (VER) byte */
+    if (socksreq[1] != 0) { /* status */
+      failf(data, "User was rejected by the SOCKS5 server (%d %d).",
+            socksreq[0], socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /* Everything is good so far, user was authenticated! */
+  }
+  else {
+    /* error */
+    if (socksreq[1] == 1) {
+      failf(data,
+            "SOCKS5 GSSAPI per-message authentication is not supported.");
+      return CURLE_COULDNT_CONNECT;
+    }
+    else if (socksreq[1] == 255) {
+      if (!proxy_name || !*proxy_name) {
+        failf(data,
+              "No authentication method was acceptable. (It is quite likely"
+              " that the SOCKS5 server wanted a username/password, since none"
+              " was supplied to the server on this connection.)");
+      }
+      else {
+        failf(data, "No authentication method was acceptable.");
+      }
+      return CURLE_COULDNT_CONNECT;
+    }
+    else {
+      failf(data,
+            "Undocumented SOCKS5 mode attempted to be used by server.");
+      return CURLE_COULDNT_CONNECT;
+    }
+  }
+
+  /* Authentication is complete, now specify destination to the proxy */
+  socksreq[0] = 5; /* version (SOCKS5) */
+  socksreq[1] = 1; /* connect */
+  socksreq[2] = 0; /* must be zero */
+  socksreq[3] = 1; /* IPv4 = 1 */
+
+  {
+    struct Curl_dns_entry *dns;
+    Curl_addrinfo *hp=NULL;
+    int rc = Curl_resolv(conn, conn->host.name, (int)conn->remote_port, &dns);
+
+    if(rc == CURLRESOLV_ERROR)
+      return CURLE_COULDNT_RESOLVE_HOST;
+
+    if(rc == CURLRESOLV_PENDING)
+      /* this requires that we're in "wait for resolve" state */
+      rc = Curl_wait_for_resolv(conn, &dns);
+
+    /*
+     * We cannot use 'hostent' as a struct that Curl_resolv() returns.  It
+     * returns a Curl_addrinfo pointer that may not always look the same.
+     */
+    if(dns)
+      hp=dns->addr;
+    if (hp) {
+      char buf[64];
+      unsigned short ip[4];
+      Curl_printable_address(hp, buf, sizeof(buf));
+
+      if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
+                      &ip[0], &ip[1], &ip[2], &ip[3])) {
+        socksreq[4] = (unsigned char)ip[0];
+        socksreq[5] = (unsigned char)ip[1];
+        socksreq[6] = (unsigned char)ip[2];
+        socksreq[7] = (unsigned char)ip[3];
+      }
+      else
+        hp = NULL; /* fail! */
+
+      Curl_resolv_unlock(data, dns); /* not used anymore from now on */
+    }
+    if(!hp) {
+      failf(data, "Failed to resolve \"%s\" for SOCKS5 connect.",
+            conn->host.name);
+      return CURLE_COULDNT_RESOLVE_HOST;
+    }
+  }
+
+  *((unsigned short*)&socksreq[8]) = htons(conn->remote_port);
+
+  {
+    const int packetsize = 10;
+
+    code = Curl_write(conn, sock, (char *)socksreq, packetsize, &written);
+    if ((code != CURLE_OK) || (written != packetsize)) {
+      failf(data, "Failed to send SOCKS5 connect request.");
+      return 1;
+    }
+
+    result = blockread_all(conn, sock, (char *)socksreq, packetsize,
+                           &actualread, timeout);
+    if ((result != CURLE_OK) || (actualread != packetsize)) {
+      failf(data, "Failed to receive SOCKS5 connect request ack.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    if (socksreq[0] != 5) { /* version */
+      failf(data,
+            "SOCKS5 reply has wrong version, version should be 5.");
+      return CURLE_COULDNT_CONNECT;
+    }
+    if (socksreq[1] != 0) { /* Anything besides 0 is an error */
+        failf(data,
+              "Can't complete SOCKS5 connection to %d.%d.%d.%d:%d. (%d)",
+              (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+              (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+              (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+              socksreq[1]);
+        return CURLE_COULDNT_CONNECT;
+    }
+  }
+
+  Curl_nonblock(sock, TRUE);
+  return CURLE_OK; /* Proxy was successful! */
+}
diff --git a/lib/socks.h b/lib/socks.h
new file mode 100644
index 000000000..b0a40a69d
--- /dev/null
+++ b/lib/socks.h
@@ -0,0 +1,19 @@
+#ifndef __SOCKS_H
+#define __SOCKS_H
+
+/*
+ * This function logs in to a SOCKS4 proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLcode Curl_SOCKS4(const char *proxy_name,
+                     struct connectdata *conn);
+
+/*
+ * This function logs in to a SOCKS5 proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLcode Curl_SOCKS5(const char *proxy_name,
+                     const char *proxy_password,
+                     struct connectdata *conn);
+
+#endif
diff --git a/lib/url.c b/lib/url.c
index 20f546900..6e5fefe10 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -132,6 +132,7 @@ void idn_free (void *ptr); /* prototype from idn-free.h, not provided by
 #include "connect.h"
 #include "inet_ntop.h"
 #include "http_ntlm.h"
+#include "socks.h"
 #include <ca-bundle.h>
 
 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
@@ -2173,476 +2174,6 @@ ConnectionStore(struct SessionHandle *data,
   return i;
 }
 
-/*
-* This function logs in to a SOCKS4 proxy and sends the specifics to the final
-* destination server.
-*
-* Reference :
-*   http://socks.permeo.com/protocol/socks4.protocol
-*
-* Note :
-*   Nonsupport "SOCKS 4A (Simple Extension to SOCKS 4 Protocol)"
-*   Nonsupport "Identification Protocol (RFC1413)"
-*/
-static int handleSock4Proxy(const char *proxy_name,
-                            struct SessionHandle *data,
-                            struct connectdata *conn)
-{
-  unsigned char socksreq[262]; /* room for SOCKS4 request incl. user id */
-  int result;
-  CURLcode code;
-  curl_socket_t sock = conn->sock[FIRSTSOCKET];
-
-  Curl_nonblock(sock, FALSE);
-
-  /*
-  * Compose socks4 request
-  *
-  * Request format
-  *
-  *     +----+----+----+----+----+----+----+----+----+----+....+----+
-  *     | VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
-  *     +----+----+----+----+----+----+----+----+----+----+....+----+
-  * # of bytes:  1    1      2              4           variable       1
-  */
-
-  socksreq[0] = 4; /* version (SOCKS4) */
-  socksreq[1] = 1; /* connect */
-  *((unsigned short*)&socksreq[2]) = htons(conn->remote_port);
-
-  /* DNS resolve */
-  {
-    struct Curl_dns_entry *dns;
-    Curl_addrinfo *hp=NULL;
-    int rc;
-
-    rc = Curl_resolv(conn, conn->host.name, (int)conn->remote_port, &dns);
-
-    if(rc == CURLRESOLV_ERROR)
-      return 1;
-
-    if(rc == CURLRESOLV_PENDING)
-      /* this requires that we're in "wait for resolve" state */
-      rc = Curl_wait_for_resolv(conn, &dns);
-
-    /*
-    * We cannot use 'hostent' as a struct that Curl_resolv() returns.  It
-    * returns a Curl_addrinfo pointer that may not always look the same.
-    */
-    if(dns)
-      hp=dns->addr;
-    if (hp) {
-      char buf[64];
-      unsigned short ip[4];
-      Curl_printable_address(hp, buf, sizeof(buf));
-
-      if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
-        &ip[0], &ip[1], &ip[2], &ip[3])) {
-          /* Set DSTIP */
-          socksreq[4] = (unsigned char)ip[0];
-          socksreq[5] = (unsigned char)ip[1];
-          socksreq[6] = (unsigned char)ip[2];
-          socksreq[7] = (unsigned char)ip[3];
-        }
-      else
-        hp = NULL; /* fail! */
-
-      Curl_resolv_unlock(data, dns); /* not used anymore from now on */
-
-    }
-    if(!hp) {
-      failf(data, "Failed to resolve \"%s\" for SOCKS4 connect.",
-        conn->host.name);
-      return 1;
-    }
-  }
-
-  /*
-   * This is currently not supporting "Identification Protocol (RFC1413)".
-   */
-  socksreq[8] = 0; /* ensure empty userid is NUL-terminated */
-  if (proxy_name)
-    strlcat((char*)socksreq + 8, proxy_name, sizeof(socksreq) - 8);
-
-  /*
-   * Make connection
-   */
-  {
-    ssize_t actualread;
-    ssize_t written;
-    int packetsize = 9 +
-      (int)strlen((char*)socksreq + 8); /* size including NUL */
-
-    /* Send request */
-    code = Curl_write(conn, sock, (char *)socksreq, packetsize, &written);
-    if ((code != CURLE_OK) || (written != packetsize)) {
-      failf(data, "Failed to send SOCKS4 connect request.");
-      return 1;
-    }
-
-    packetsize = 8; /* receive data size */
-
-    /* Receive response */
-    result = Curl_read(conn, sock, (char *)socksreq, packetsize, &actualread);
-    if ((result != CURLE_OK) || (actualread != packetsize)) {
-      failf(data, "Failed to receive SOCKS4 connect request ack.");
-      return 1;
-    }
-
-    /*
-    * Response format
-    *
-    *     +----+----+----+----+----+----+----+----+
-    *     | VN | CD | DSTPORT |      DSTIP        |
-    *     +----+----+----+----+----+----+----+----+
-    * # of bytes:  1    1      2              4
-    *
-    * VN is the version of the reply code and should be 0. CD is the result
-    * code with one of the following values:
-    *
-    * 90: request granted
-    * 91: request rejected or failed
-    * 92: request rejected because SOCKS server cannot connect to
-    *     identd on the client
-    * 93: request rejected because the client program and identd
-    *     report different user-ids
-    */
-
-    /* wrong version ? */
-    if (socksreq[0] != 0) {
-      failf(data,
-        "SOCKS4 reply has wrong version, version should be 4.");
-      return 1;
-    }
-
-    /* Result */
-    switch(socksreq[1])
-    {
-      case 90:
-        infof(data, "SOCKS4 request granted.\n");
-        break;
-      case 91:
-        failf(data,
-          "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
-          ", request rejected or failed.",
-          (unsigned char)socksreq[4], (unsigned char)socksreq[5],
-          (unsigned char)socksreq[6], (unsigned char)socksreq[7],
-          (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
-          socksreq[1]);
-        return 1;
-      case 92:
-        failf(data,
-          "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
-          ", request rejected because SOCKS server cannot connect to "
-          "identd on the client.",
-          (unsigned char)socksreq[4], (unsigned char)socksreq[5],
-          (unsigned char)socksreq[6], (unsigned char)socksreq[7],
-          (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
-          socksreq[1]);
-        return 1;
-      case 93:
-        failf(data,
-          "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
-          ", request rejected because the client program and identd "
-          "report different user-ids.",
-          (unsigned char)socksreq[4], (unsigned char)socksreq[5],
-          (unsigned char)socksreq[6], (unsigned char)socksreq[7],
-          (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
-          socksreq[1]);
-        return 1;
-      default :
-        failf(data,
-          "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
-          ", Unknown.",
-          (unsigned char)socksreq[4], (unsigned char)socksreq[5],
-          (unsigned char)socksreq[6], (unsigned char)socksreq[7],
-          (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
-          socksreq[1]);
-        return 1;
-    }
-  }
-
-  Curl_nonblock(sock, TRUE);
-
-  return 0; /* Proxy was successful! */
-}
-
-/*
- * This function logs in to a SOCKS5 proxy and sends the specifics to the final
- * destination server.
- */
-static int handleSock5Proxy(const char *proxy_name,
-                            const char *proxy_password,
-                            struct connectdata *conn)
-{
-  /*
-    According to the RFC1928, section "6.  Replies". This is what a SOCK5
-    replies:
-
-        +----+-----+-------+------+----------+----------+
-        |VER | REP |  RSV  | ATYP | BND.ADDR | BND.PORT |
-        +----+-----+-------+------+----------+----------+
-        | 1  |  1  | X'00' |  1   | Variable |    2     |
-        +----+-----+-------+------+----------+----------+
-
-    Where:
-
-    o  VER    protocol version: X'05'
-    o  REP    Reply field:
-    o  X'00' succeeded
-  */
-
-  unsigned char socksreq[600]; /* room for large user/pw (255 max each) */
-  ssize_t actualread;
-  ssize_t written;
-  int result;
-  CURLcode code;
-  curl_socket_t sock = conn->sock[FIRSTSOCKET];
-  struct SessionHandle *data = conn->data;
-  long timeout;
-
-  /* get timeout */
-  if(data->set.timeout && data->set.connecttimeout) {
-    if (data->set.timeout < data->set.connecttimeout)
-      timeout = data->set.timeout*1000;
-    else
-      timeout = data->set.connecttimeout*1000;
-  }
-  else if(data->set.timeout)
-    timeout = data->set.timeout*1000;
-  else if(data->set.connecttimeout)
-    timeout = data->set.connecttimeout*1000;
-  else
-    timeout = DEFAULT_CONNECT_TIMEOUT;
-
-  Curl_nonblock(sock, TRUE);
-
-  /* wait until socket gets connected */
-  result = Curl_select(CURL_SOCKET_BAD, sock, (int)timeout);
-
-  if(-1 == result) {
-    failf(conn->data, "SOCKS5: no connection here");
-    return 1;
-  }
-  else if(0 == result) {
-    failf(conn->data, "SOCKS5: connection timeout");
-    return 1;
-  }
-
-  if(result & CSELECT_ERR) {
-    failf(conn->data, "SOCKS5: error occured during connection");
-    return 1;
-  }
-
-  socksreq[0] = 5; /* version */
-  socksreq[1] = (char)(proxy_name ? 2 : 1); /* number of methods (below) */
-  socksreq[2] = 0; /* no authentication */
-  socksreq[3] = 2; /* username/password */
-
-  Curl_nonblock(sock, FALSE);
-
-  code = Curl_write(conn, sock, (char *)socksreq, (2 + (int)socksreq[1]),
-                      &written);
-  if ((code != CURLE_OK) || (written != (2 + (int)socksreq[1]))) {
-    failf(data, "Unable to send initial SOCKS5 request.");
-    return 1;
-  }
-
-  Curl_nonblock(sock, TRUE);
-
-  result = Curl_select(sock, CURL_SOCKET_BAD, (int)timeout);
-
-  if(-1 == result) {
-    failf(conn->data, "SOCKS5 nothing to read");
-    return 1;
-  }
-  else if(0 == result) {
-    failf(conn->data, "SOCKS5 read timeout");
-    return 1;
-  }
-
-  if(result & CSELECT_ERR) {
-    failf(conn->data, "SOCKS5 read error occured");
-    return 1;
-  }
-
-  Curl_nonblock(sock, FALSE);
-
-  result=Curl_read(conn, sock, (char *)socksreq, 2, &actualread);
-  if ((result != CURLE_OK) || (actualread != 2)) {
-    failf(data, "Unable to receive initial SOCKS5 response.");
-    return 1;
-  }
-
-  if (socksreq[0] != 5) {
-    failf(data, "Received invalid version in initial SOCKS5 response.");
-    return 1;
-  }
-  if (socksreq[1] == 0) {
-    /* Nothing to do, no authentication needed */
-    ;
-  }
-  else if (socksreq[1] == 2) {
-    /* Needs user name and password */
-    size_t userlen, pwlen;
-    int len;
-    if(proxy_name && proxy_password) {
-      userlen = strlen(proxy_name);
-      pwlen = proxy_password?strlen(proxy_password):0;
-    }
-    else {
-      userlen = 0;
-      pwlen = 0;
-    }
-
-    /*   username/password request looks like
-     * +----+------+----------+------+----------+
-     * |VER | ULEN |  UNAME   | PLEN |  PASSWD  |
-     * +----+------+----------+------+----------+
-     * | 1  |  1   | 1 to 255 |  1   | 1 to 255 |
-     * +----+------+----------+------+----------+
-     */
-    len = 0;
-    socksreq[len++] = 1;    /* username/pw subnegotiation version */
-    socksreq[len++] = (char) userlen;
-    memcpy(socksreq + len, proxy_name, (int) userlen);
-    len += userlen;
-    socksreq[len++] = (char) pwlen;
-    memcpy(socksreq + len, proxy_password, (int) pwlen);
-    len += pwlen;
-
-    code = Curl_write(conn, sock, (char *)socksreq, len, &written);
-    if ((code != CURLE_OK) || (len != written)) {
-      failf(data, "Failed to send SOCKS5 sub-negotiation request.");
-      return 1;
-    }
-
-    result=Curl_read(conn, sock, (char *)socksreq, 2, &actualread);
-    if ((result != CURLE_OK) || (actualread != 2)) {
-      failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
-      return 1;
-    }
-
-    /* ignore the first (VER) byte */
-    if (socksreq[1] != 0) { /* status */
-      failf(data, "User was rejected by the SOCKS5 server (%d %d).",
-            socksreq[0], socksreq[1]);
-      return 1;
-    }
-
-    /* Everything is good so far, user was authenticated! */
-  }
-  else {
-    /* error */
-    if (socksreq[1] == 1) {
-      failf(data,
-            "SOCKS5 GSSAPI per-message authentication is not supported.");
-      return 1;
-    }
-    else if (socksreq[1] == 255) {
-      if (!proxy_name || !*proxy_name) {
-        failf(data,
-              "No authentication method was acceptable. (It is quite likely"
-              " that the SOCKS5 server wanted a username/password, since none"
-              " was supplied to the server on this connection.)");
-      }
-      else {
-        failf(data, "No authentication method was acceptable.");
-      }
-      return 1;
-    }
-    else {
-      failf(data,
-            "Undocumented SOCKS5 mode attempted to be used by server.");
-      return 1;
-    }
-  }
-
-  /* Authentication is complete, now specify destination to the proxy */
-  socksreq[0] = 5; /* version (SOCKS5) */
-  socksreq[1] = 1; /* connect */
-  socksreq[2] = 0; /* must be zero */
-  socksreq[3] = 1; /* IPv4 = 1 */
-
-  {
-    struct Curl_dns_entry *dns;
-    Curl_addrinfo *hp=NULL;
-    int rc = Curl_resolv(conn, conn->host.name, (int)conn->remote_port, &dns);
-
-    if(rc == CURLRESOLV_ERROR)
-      return 1;
-
-    if(rc == CURLRESOLV_PENDING)
-      /* this requires that we're in "wait for resolve" state */
-      rc = Curl_wait_for_resolv(conn, &dns);
-
-    /*
-     * We cannot use 'hostent' as a struct that Curl_resolv() returns.  It
-     * returns a Curl_addrinfo pointer that may not always look the same.
-     */
-    if(dns)
-      hp=dns->addr;
-    if (hp) {
-      char buf[64];
-      unsigned short ip[4];
-      Curl_printable_address(hp, buf, sizeof(buf));
-
-      if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
-                      &ip[0], &ip[1], &ip[2], &ip[3])) {
-        socksreq[4] = (unsigned char)ip[0];
-        socksreq[5] = (unsigned char)ip[1];
-        socksreq[6] = (unsigned char)ip[2];
-        socksreq[7] = (unsigned char)ip[3];
-      }
-      else
-        hp = NULL; /* fail! */
-
-      Curl_resolv_unlock(data, dns); /* not used anymore from now on */
-    }
-    if(!hp) {
-      failf(data, "Failed to resolve \"%s\" for SOCKS5 connect.",
-            conn->host.name);
-      return 1;
-    }
-  }
-
-  *((unsigned short*)&socksreq[8]) = htons(conn->remote_port);
-
-  {
-    const int packetsize = 10;
-
-    code = Curl_write(conn, sock, (char *)socksreq, packetsize, &written);
-    if ((code != CURLE_OK) || (written != packetsize)) {
-      failf(data, "Failed to send SOCKS5 connect request.");
-      return 1;
-    }
-
-    result = Curl_read(conn, sock, (char *)socksreq, packetsize, &actualread);
-    if ((result != CURLE_OK) || (actualread != packetsize)) {
-      failf(data, "Failed to receive SOCKS5 connect request ack.");
-      return 1;
-    }
-
-    if (socksreq[0] != 5) { /* version */
-      failf(data,
-            "SOCKS5 reply has wrong version, version should be 5.");
-      return 1;
-    }
-    if (socksreq[1] != 0) { /* Anything besides 0 is an error */
-        failf(data,
-              "Can't complete SOCKS5 connection to %d.%d.%d.%d:%d. (%d)",
-              (unsigned char)socksreq[4], (unsigned char)socksreq[5],
-              (unsigned char)socksreq[6], (unsigned char)socksreq[7],
-              (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
-              socksreq[1]);
-        return 1;
-    }
-  }
-
-  Curl_nonblock(sock, TRUE);
-  return 0; /* Proxy was successful! */
-}
-
 static CURLcode ConnectPlease(struct SessionHandle *data,
                               struct connectdata *conn,
                               struct Curl_dns_entry *hostaddr,
@@ -2673,19 +2204,18 @@ static CURLcode ConnectPlease(struct SessionHandle *data,
 
     switch(data->set.proxytype) {
     case CURLPROXY_SOCKS5:
-      return handleSock5Proxy(conn->proxyuser,
-                              conn->proxypasswd,
-                              conn) ?
-        CURLE_COULDNT_CONNECT : CURLE_OK;
+      result = Curl_SOCKS5(conn->proxyuser, conn->proxypasswd, conn);
+      break;
     case CURLPROXY_HTTP:
       /* do nothing here. handled later. */
       break;
     case CURLPROXY_SOCKS4:
-      return handleSock4Proxy(conn->proxyuser, data, conn) ?
-        CURLE_COULDNT_CONNECT : CURLE_OK;
+      result = Curl_SOCKS4(conn->proxyuser, conn);
+      break;
     default:
       failf(data, "unknown proxytype option given");
-      return CURLE_COULDNT_CONNECT;
+      result = CURLE_COULDNT_CONNECT;
+      break;
     }
   }